On extended sign-changeable interactions in the dark sector

We extend the cosmological couplings proposed in Sun et al. and Wei, where they suggested interactions with change of signs along the cosmological evolution. Our extension liberates the changes of sign of the interaction from the deceleration parameter and from the relation of energy densities of th...

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Autor principal: Forte, M.
Formato: JOUR
Materias:
Cosmological coincidence
Crisis of age
Dark energy
Dark matter
Sign-changeable interactions
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00017701_v46_n10_p1_Forte
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00017701_v46_n10_p1_Forte
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spelling todo:paper_00017701_v46_n10_p1_Forte2023-10-03T13:52:08Z On extended sign-changeable interactions in the dark sector Forte, M. Cosmological coincidence Crisis of age Dark energy Dark matter Sign-changeable interactions We extend the cosmological couplings proposed in Sun et al. and Wei, where they suggested interactions with change of signs along the cosmological evolution. Our extension liberates the changes of sign of the interaction from the deceleration parameter and from the relation of energy densities of the dark sector and considers the presence of non interactive matter. In three cases we obtain the general solutions and the results obtained in models fitted with Hubble’s function and SNe Ia data, are analyzed regarding the problem of the cosmological coincidence, the problem of the crisis of the cosmological age and the magnitude of the energy density of dark energy at early universe. Also we graphically study the range of variation of, the actual dark matter density parameter, the effective equation of state of the dark energy and the redshift of transition to the accelerated regimen, generated by variations at order 1σ in the coupling parameters. © 2014, Springer Science+Business Media New York. Fil:Forte, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00017701_v46_n10_p1_Forte
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmological coincidence
Crisis of age
Dark energy
Dark matter
Sign-changeable interactions
spellingShingle Cosmological coincidence
Crisis of age
Dark energy
Dark matter
Sign-changeable interactions
Forte, M.
On extended sign-changeable interactions in the dark sector
topic_facet Cosmological coincidence
Crisis of age
Dark energy
Dark matter
Sign-changeable interactions
description We extend the cosmological couplings proposed in Sun et al. and Wei, where they suggested interactions with change of signs along the cosmological evolution. Our extension liberates the changes of sign of the interaction from the deceleration parameter and from the relation of energy densities of the dark sector and considers the presence of non interactive matter. In three cases we obtain the general solutions and the results obtained in models fitted with Hubble’s function and SNe Ia data, are analyzed regarding the problem of the cosmological coincidence, the problem of the crisis of the cosmological age and the magnitude of the energy density of dark energy at early universe. Also we graphically study the range of variation of, the actual dark matter density parameter, the effective equation of state of the dark energy and the redshift of transition to the accelerated regimen, generated by variations at order 1σ in the coupling parameters. © 2014, Springer Science+Business Media New York.
format JOUR
author Forte, M.
author_facet Forte, M.
author_sort Forte, M.
title On extended sign-changeable interactions in the dark sector
title_short On extended sign-changeable interactions in the dark sector
title_full On extended sign-changeable interactions in the dark sector
title_fullStr On extended sign-changeable interactions in the dark sector
title_full_unstemmed On extended sign-changeable interactions in the dark sector
title_sort on extended sign-changeable interactions in the dark sector
url http://hdl.handle.net/20.500.12110/paper_00017701_v46_n10_p1_Forte
work_keys_str_mv AT fortem onextendedsignchangeableinteractionsinthedarksector
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